Even outsiders love restitched sports coat (8)
I believe the answer is:
envelope
'coat' is the definition.
(I've seen this before)
'even outsiders love restitched sports' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'even' is 'enve' which is within the answer.
'love' could be 'o' (In tennis, 'love' means 'zero') and 'o' is present in the answer.
'sports' could be 'pe' (Physical Education) and 'pe' is found within the answer.
A single letter 'l' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for envelope that I've seen before include "Cover for letter" , "note might be put into this" , "Rectangular paper container" , "Sheath, wrapping" , "Postal wrapper" .)