Scout to croon entire performance (11)
I believe the answer is:
reconnoitre
'scout' is the definition.
(synonyms)
'croon entire performance' is the wordplay.
'performance' indicates an anagram.
'croon'+'entire'='croonentire'
'croonentire' with letters rearranged gives 'RECONNOITRE'.
'to' acts as a link.
(Other definitions for reconnoitre that I've seen before include "Make military examination of (a region)" , "Make a preliminary examination" , "Survey area" , "case" , "Spy out (a region)" .)