He turns in with an injured leg (5)
I believe the answer is:
nigel
'he' is the definition.
'turns in with an injured leg' is the wordplay.
'turns' is a reversal indicator.
'with' means one lot of letters go next to another.
'an injured' is an anagram indicator.
'in' in reverse letter order is 'ni'.
'leg' anagrammed gives 'gel'.
'ni'+'gel'='NIGEL'
(Other definitions for nigel that I've seen before include "Chap" , "Fellows sometimes called this" , "man?" , "boy" , "First name of the leader of the Brexit Party since 2019" .)