Give a sign to party that's white (7)
I believe the answer is:
cueball
'white' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'give a sign to party' is the wordplay.
'give' means one lot of letters go next to another.
'a sign' becomes 'cue' (a cue is a sign or signal).
'to party' becomes 'ball' (ball is a kind of party).
'cue' next to 'ball' is 'CUEBALL'.
'that's' acts as a link.
Can you help me to learn more?
(Another definition for cueball that I've seen is " white?".)