Unusual allocation - mine is an ointment (8,6)

I believe the answer is:

calamine lotion

I'm a little stuck... Click here to teach me more about this clue!

'an ointment' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'unusual allocation mine' is the wordplay.
'unusual' indicates an anagram.
'allocation'+'mine'='allocationmine'
'allocationmine' anagrammed gives 'CALAMINE LOTION'.

'is' is the link.

Can you help me to learn more?

(Other definitions for calamine lotion that I've seen before include "calmer" , "soothing stuff" .)

I've seen this clue in The Daily Express.

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