Married, I occasionally like a drink (4)
I believe the answer is:
milk
'a drink' is the definition.
(milk is a kind of drink)
'married i occasionally like' is the wordplay.
'married' becomes 'm'.
'occasionally' indicates alternate letters.
The alternate letters of 'like' are 'lk'.
'm'+'i'+'lk'='MILK'
(Other definitions for milk that I've seen before include "Source of cream/butter" , "an early delivery?" , "Use" , "Dairy product" , "Extract money from" .)