Rude gesture by queen in pool (7)
I believe the answer is:
snooker
'pool' is the definition.
(snooker is a kind of pool)
'rude gesture by queen' is the wordplay.
I cannot quite see how this works, but
'queen' could be 'er' (abbreviation for Elizabeth Regina) and 'er' is found within the answer.
The remaining letters 'snook' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for snooker that I've seen before include "Cue sport" , "Indoor ball game" , "Game with coloured balls" , "check?" , "Game with 22 balls" .)