Couple in ardent wooing (3)
I believe the answer is:
two
'couple' is the definition.
(thesaurus)
'in ardent wooing' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TWO' can be found hidden inside 'ardent wooing'.
(Other definitions for two that I've seen before include "Between one and three" , "limited company?" , "Company allegedly" , "A low number" , "II" .)