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 a hidden word.
'INGRAIN' can be found hidden inside 'leaking raincoat'.
(Other definitions for ingrain that I've seen before include "deeply impressed" , "Drive home" , "Raining? (anagram)" , "Firmly establish (habit)" , "Make a habit" .)