Humourless cynic ill, snarling in medical centre (10)

I believe the answer is:

polyclinic

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'medical centre' is the definition.
The definition suggests a singular noun which matches the answer.

'humourless cynic ill snarling' is the wordplay.
'humourless' becomes 'po' (I've seen this in other clues).
'snarling' indicates an anagram (I've seen 'snarled' mean this (to snarl can mean to entangle or twist)).
'cynic'+'ill'='cynicill'
'cynicill' is an anagram of 'lyclinic'.
'po'+'lyclinic'='POLYCLINIC'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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