Irritate the French after tearing tent (6)
I believe the answer is:
nettle
'irritate' is the definition.
('nettle' can be a synonym of 'irritate')
'the french after tearing tent' is the wordplay.
'the french' becomes 'le'.
'after' means one lot of letters go next to another.
'tearing' is an anagram indicator.
'tent' is an anagram of 'nett'.
'le' put after 'nett' is 'NETTLE'.
(Other definitions for nettle that I've seen before include "sample of herbal tea?" , "anger?" , "Wild plant - annoy" , "Annoy - stinger" , "Irritate - weed" .)