Imagine having drink with model (7)
I believe the answer is:
suppose
'imagine' is the definition.
('suppose' can be a synonym of 'imagine')
'drink with model' is the wordplay.
'drink' becomes 'sup' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'model' becomes 'pose' ('pose' can be a synonym of 'model').
'sup'+'pose'='SUPPOSE'
'having' is the link.
(Other definitions for suppose that I've seen before include "Picture" , "Put forward - imagine" , "Presume" , "Judge" , "Assume without proof" .)