Sucker, having tablet during game, flipped (8)
I believe the answer is:
lollipop
'sucker' is the definition.
(synonyms)
'tablet during game flipped' is the wordplay.
'tablet' becomes 'pill' (synonyms).
'during' indicates putting letters inside.
'game' becomes 'pool' (pool is a kind of game).
'flipped' shows that the letters should be reversed in order.
'pill' going into 'pool' is 'popillol'.
'popillol' back-to-front is 'LOLLIPOP'.
'having' acts as a link.
(Other definitions for lollipop that I've seen before include "Candy on a stick" , "Popsicle" , "Nutcracker Suite, say" , "Confectionery" , "Ice confection" .)