How one may lie in party game, stutteringly (5)
I believe the answer is:
doggo
'how one may lie' is the definition.
(to lie doggo is to lie down without moving)
'in party game stutteringly' is the wordplay.
'in' indicates putting letters inside.
'party' becomes 'do' (do is a kind of party).
'game' becomes 'go' (go game is a kind of game).
'stutteringly' becomes 'g' (I can't explain this - if you can you should give a lot more credence to this answer).
'do'+'go'='dogo'
'dogo' going around 'g' is 'DOGGO'.
(Other definitions for doggo that I've seen before include "Lie . . . . . , motionless or hidden" , "out of sight" , "(Lie) in concealment" , "How some people lie!" , "lying low" .)