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A regular poser no doubt (7,5)

Ross

I believe the answer is:

artists model

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

'no doubt' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'a regular poser' is the wordplay.
'a regular' becomes 'artists' (I can't justify this - if you can you should believe this answer much more).
'poser' becomes 'model' (e.g. a model for an artist - someone who poses).
'artists'+'model'='ARTISTS MODEL'

Can you help me to learn more?

(Another definition for artists model that I've seen is " Sitter for painter".)

I've seen this clue in The Globe and Mail.
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