Goes to mend the tent, in a sad state of disrepair (7)
I believe the answer is:
attends
'goes to' is the definition.
('attend' can be a synonym of 'go to')
'mend the tent in a sad state of disrepair' is the wordplay.
'mend' indicates anagramming the letters (I've seen 'mended' mean this).
'in' is an insertion indicator.
'a sad state of disrepair' becomes 'ads' (I can't explain this - if you can you should give a lot more credence to this answer).
'tent' with letters rearranged gives 'tten'.
'tten' placed inside 'ads' is 'ATTENDS'.
Can you help me to learn more?
(Other definitions for attends that I've seen before include "to listen carefully" , "Pays attention" , "Appears" , "Listens" , "Waits on or is present" .)