Model not including enough (7)

I believe the answer is:

example

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'model' is the definition.
('example' can be a synonym of 'model')

'not including enough' is the wordplay.
'not including' becomes 'ex' (I can't explain this - if you can you should believe this answer much more).
'enough' becomes 'ample' (I've seen this before).
'ex'+'ample'='EXAMPLE'

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(Other definitions for example that I've seen before include "Specimen, sample" , "Instance, specimen" , "Thing characteristic of its kind" , "lesson" , "Someone to emulate" .)

I've seen this clue in The Telegraph.

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