Provide food for domestic pet (queen) (5)
I believe the answer is:
cater
'provide food' is the definition.
(I've seen this before)
'domestic pet queen' is the wordplay.
'domestic pet' becomes 'cat'.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'cat'+'er'='CATER'
'for' acts as a link.
(Other definitions for cater that I've seen before include "Provide goods or services for" , "... you'll see minister" , "Provide food etc" , "Provide service for like grocer" , "Trace (anag.)" .)