One small boy in the Scillies, for example (5)
I believe the answer is:
isles
'the scillies for example' is the definition.
I can't judge whether this definition defines the answer.
'one small boy' is the wordplay.
'one' becomes 'i' (Roman numeral).
'small' becomes 's' (abbreviation - e.g. clothes size).
'boy' becomes 'les' (short for Leslie).
'i'+'s'+'les'='ISLES'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for isles that I've seen before include "Hebrides, for example" , "- - of Scilly" , "Hebrides, perhaps" , "British locations, say?" , "eg the Scillies" .)