Railway engineer sent phones for repair (10)
I believe the answer is:
stephenson
'railway engineer' is the definition.
(railway pioneer Robert Stephenson)
'sent phones for repair' is the wordplay.
'for repair' is an anagram indicator (I've seen this in other clues).
'sent'+'phones'='sentphones'
'sentphones' anagrammed gives 'STEPHENSON'.
(Other definitions for stephenson that I've seen before include "Rocket engineer" , "George --, rail pioneer" , "Train man" , "Loco engineer" , "Rocket man" .)