Recognise monarch hunting (7)
I believe the answer is:
seeking
'hunting' is the definition.
(thesaurus)
'recognise monarch' is the wordplay.
'recognise' becomes 'see' (I've seen this before).
'monarch' becomes 'king' (king is a kind of monarch).
'see'+'king'='SEEKING'
(Other definitions for seeking that I've seen before include "On the hunt for" , "Requesting" , "Applying" , "on search mission" , "Searching for" .)