Perhaps Morricone at home stops one climbing (5)

'perhaps morricone' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'home stops one climbing' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'stops' means one lot of letters goes inside another (stopping can mean blocking a gap).
'climbing' is a reversal indicator (in a down clue, letters climb up).
'in' put within 'one' is 'oinne'.
'oinne' backwards is 'ENNIO'.

'at' acts as a link.

Can you help me to learn more?