Type of film showing small fellow - one going round the Channel Islands (5)

I believe the answer is:

scifi

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'type of film' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'small fellow one going round the channel islands' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fellow' becomes 'f' (abbreviation - of a society etc.).
'one' becomes 'i' (Roman numeral).
'going round' indicates putting letters inside (some letters go around others).
'the channel islands' becomes 'CI'.
's'+'f'+'i'='sfi'
'sfi' enclosing 'ci' is 'SCIFI'.

'showing' acts as a link.

Can you help me to learn more?

(Other definitions for scifi that I've seen before include "22 Across [TREKKIE] literature" , "Literary genre" .)

I've seen this clue in The Daily Express.

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