Company hasn't time to make suppositions (5)
I believe the answer is:
guess
'to make suppositions' is the definition.
'company hasn't time' is the wordplay.
'company' becomes 'guests' (I've seen this before).
'hasn't' suggests deleting specific letters.
'time' becomes 't'.
'guests' with 't' taken out is 'GUESS'.
(Other definitions for guess that I've seen before include "Speculation" , "Imagine" , "Estimate, supposition" , "Make stab at" , "Estimate; suppose" .)