Provide feline companion for Queen (5)
I believe the answer is:
cater
'provide' is the definition.
(catering is a kind of providing)
'feline companion for queen' is the wordplay.
'feline' becomes 'cat' (I've seen this before).
'companion for' says to put letters next to each other (some letters accompany other letters).
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'cat'+'er'='CATER'
(Other definitions for cater that I've seen before include "Trace (anag.)" , "Provide food etc" , "Provide what is needed or wanted" , "Provide goods or services for" , "Make provision for" .)