Catch sight of tailless sow (3)
I believe the answer is:
see
'catch sight of' is the definition.
(thesaurus)
'tailless sow' is the wordplay.
'tailless' means to remove the last letter.
'sow' becomes 'seed' ('seed' can be a synonym of 'sow').
'seed' with its last letter taken off is 'SEE'.
(Other definitions for see that I've seen before include "Appreciate" , "Perceive, watch" , "judge" , "District of a bishop - or Pope" , "Realize" .)