Game in long time one must stop: these from 3 not enough! (9)
I believe the answer is:
apologies
'these from 3 not enough' is the definition.
The definition suggests an adverb but the answer is not.
'game in long time one must stop' is the wordplay.
'game' becomes 'polo' (polo is a kind of game).
'in' is an insertion indicator.
'long time' becomes 'ages' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'must stop' indicates putting letters inside (stopping can mean blocking a gap).
'polo' inserted inside 'ages' is 'apologes'.
'apologes' going around 'i' is 'APOLOGIES'.
Can you help me to learn more?
(Other definitions for apologies that I've seen before include "Excuses; regrets" , "sorry" .)