Somehow settle pup - one of seven (9)

I believe the answer is:

septuplet

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'one of seven' is the definition.
The definition suggests a singular noun which matches the answer.

'somehow settle pup' is the wordplay.
'somehow' indicates anagramming the letters.
'settle'+'pup'='settlepup'
'settlepup' anagrammed gives 'SEPTUPLET'.

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(Other definitions for septuplet that I've seen before include "Quick notes" , "unusual baby" , "One in large family" .)

I've seen this clue in The Mirror.

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