Sadly admires small weapons worn in belt (8)

I believe the answer is:

sidearms

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'weapons worn in belt' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'sadly admires small' is the wordplay.
'sadly' is an anagram indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'admires' anagrammed gives 'sidearm'.
'sidearm'+'s'='SIDEARMS'

Can you help me to learn more?

(Other definitions for sidearms that I've seen before include "weapons" , "We could kill" .)

I've seen this clue in The Telegraph.

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