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Sell iodine compound that keeps bats in good nick (7,3)

Ross

I believe the answer is:

linseed oil

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'sell iodine compound that keeps bats in good nick' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'sell iodine compound' is the wordplay.
'compound' is an anagram indicator.
'sell'+'iodine'='selliodine'
'selliodine' is an anagram of 'LINSEED-OIL'.

Can you help me to learn more?

(Other definitions for linseed oil that I've seen before include "what's used in making printer's ink" , "for application in sport" , "product out of flax" , "Varnish and paint ingredient" , "Paint/varnish ingredient" .)

I've seen this clue in The Times.
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