Fix section of leaking raincoat (7)
I believe the answer is:
ingrain
'fix' is the definition.
(I've seen this before)
'section of leaking raincoat' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'INGRAIN' is hidden within 'leaking raincoat'.
(Other definitions for ingrain that I've seen before include "deeply impressed" , "Drive home" , "Raining? (anagram)" , "Firmly establish (habit)" , "Make a habit" .)