Bothered at the weed, on the day (7)
I believe the answer is:
nettled
'bothered' is the definition.
('nettle' can be a synonym of 'bother')
'the weed on the day' is the wordplay.
'the weed' becomes 'nettle' (nettle is a kind of weed).
'on' is a charade indicator (letters next to each other).
'the day' becomes 'd'.
'nettle'+'d'='NETTLED'
'at' is the link.
(Other definitions for nettled that I've seen before include "Stung!" , "Riled" , "Provoked" , "Annoyed as by stinging plant" , "annoyed one" .)