Threefix - a performance game

Usual deal, someone is giving clues to get someone else to guess a
word.  However, this time the cluer doesn't know the answer either (at
first).

For any given round, there are three players: the Writer, the Cluer,
and the Guesser.

The Writer is given a card with an answer word printed on it, and must
come up with a three-word clue for the answer, and write that clue on
the card.  For example, suppose the answer word was BEATLES; the
Writer might write "FOUR LIVERPUDLIAN GUYS".

There is a whiteboard which the Cluer and the audience can see, but
the Guesser cannot see.  The first letter of the answer word and the
first letter of each of the three clue words on the card are written
on the whiteboard:


B
-----------
F
L
G


The Cluer must come up with some clue matching the letters on the
whiteboard; they do not need to have an answer word in mind, they just
need to say something that matches the three prefixes so far
available.  The Guesser makes a guess based on the clue, even though
at this point, the cluer's clue is unlikely to actually be cluing the
correct answer.  For example, based on the above letters, the Cluer
might say, "funny looping glue", and the guesser, with nothing else to
go on, might say "Elmer's".

More letters are added to the whiteboard, and the cluer keeps giving
clues, until the Guesser gets the word.  Doesn't matter whether the
Cluer gives the "correct" clue, only whether the Guesser gets the
correct word.

BE
-----------
FO
LI
GU

Cluer at this point might say "folky liquid guys".  The person writing
the letters onto the whiteboard from the card can add letters slowly
(and not necessarily in order), so that at this point, maybe just
adding this much:

BEA
-----------
FO
LIV
GU

might be sufficient for the Cluer to say "four liverpool guys", and
the Guesser to get the answer.