Gapes at an unlucky goal conceded by Les (5)
I believe the answer is:
ogles
'gapes at an unlucky goal conceded' is the definition.
I can't tell whether this definition defines the answer.
'by les' is the wordplay.
'by' becomes 'og' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'og'+'les'='OGLES'
Can you help me to learn more?
(Other definitions for ogles that I've seen before include "Looks longingly at" , "Casts amorous glances" , "Leers" , "Looks at amorously, makes eyes at" , "Looks at (someone) lecherously" .)