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Thin album's rough and ready portrait (9)

Ross

I believe the answer is:

thumbnail

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

'ready portrait' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'thin album's rough' is the wordplay.
'rough' indicates an anagram (a rough or broken ordering of the letters).
'thin'+'album'='thinalbum'
'thinalbum' is an anagram of 'THUMBNAIL'.

'and' acts as a link.

Can you help me to learn more?

(Other definitions for thumbnail that I've seen before include "Kind of sketch r" , "Small image" , "This digital-type sketch is brief and concise" , "type of sketch" , "Particular sketch" .)

I've seen this clue in the Sydney Morning Herald.
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