Is able to discourage holding bottle (8)
I believe the answer is:
decanter
'bottle' is the definition.
(decanter is a kind of bottle)
'is able to discourage holding' is the wordplay.
'is able to' becomes 'can' (I've seen this before).
'discourage' becomes 'deter' ('deter' can be a synonym of 'discourage').
'holding' indicates putting letters inside.
'can' placed inside 'deter' is 'DECANTER'.
(Other definitions for decanter that I've seen before include "receptacle for wine" , "Liquor vessel" , "glass full of drink" , "Type of bottle" , "Stoppered liquor container" .)