Crossword Genius

Italian physician returned home — a very small delay (7)

Ross

I believe the answer is:

galvani

I'm a little stuck... Click here to teach me more about this clue!

'italian physician' is the definition.
The definition suggests a singular noun which matches the answer.

'returned home a very small delay' is the wordplay.
'returned' says the letters should be written backwards.
'home' becomes 'in' ('he's home' can mean 'he's in').
'very small' becomes 'v' (abbreviated or small form of 'very').
'delay' becomes 'lag' (lag is a kind of delay).
'in'+'a'+'v'+'lag'='inavlag'
'inavlag' written backwards gives 'GALVANI'.

Can you help me to learn more?

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app