It’s his job to provide cover (5)
I believe the answer is:
tiler
'it's his job to' is the definition.
The definition suggests a singular noun which matches the answer.
'cover' is the wordplay.
I cannot really see how this works, but
'cover' could be 'tile' (tiling is a kind of covering) and 'tile' is present in the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'provide' is the link.
Can you help me to learn more?
(Other definitions for tiler that I've seen before include "Worker who lays small squares" , "Tradesman who covers roofs or bathroom walls with rectangular materials" , "High-level operator" , "doorkeeper at lodge" , "Relit for tradesman" .)