In film, sounds like a little horse? Sounds like it! (5)

'horse? sounds like it' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'in film sounds like a little' is the wordplay.
'in' means one lot of letters goes inside another.
'film sounds' becomes 'foe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'like' becomes 'y' (similar in meaning).
'a little' becomes 'l' (abbreviation for little).
'foe'+'y'='foey'
'foey' placed around 'l' is 'FOLEY'.

Can you help me to learn more?