Stable in Gulf leading at the end of the day (7)
I believe the answer is:
evening
'the end of the day' is the definition.
(I've seen this before)
'stable in gulf leading' is the wordplay.
'stable' becomes 'even' (I've seen this before).
'leading' suggests taking the first letters.
The initial letter of 'gulf' is 'g'.
'even'+'in'+'g'='EVENING'
'at' is the link.
(Other definitions for evening that I've seen before include "Preparing flat" , "Some Enchanted - - (song)" , "Ironing" , "Subject of nocturne" , "time for putting feet up?" .)