Watch new tears (5)
I believe the answer is:
stare
'watch' is the definition.
(thesaurus)
'new tears' is the wordplay.
'new' is an anagram indicator.
'tears' anagrammed gives 'STARE'.
(Other definitions for stare that I've seen before include "Look hard" , "'Look fixedly, without blinking (5)'" , "Gawp" , "Long fixed look" , "bird" .)