Former partner, rather bulky specimen (7)

I believe the answer is:

example

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'specimen' is the definition.
(I've seen this before)

'former partner rather bulky' is the wordplay.
'former partner' becomes 'ex' (an ex-partner).
'rather bulky' becomes 'ample' (I've seen this before. I am not sure about the 'rather' bit.).
'ex'+'ample'='EXAMPLE'

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(Other definitions for example that I've seen before include "Illustrative exercise" , "Illustration or paradigm" , "Specimen, sample" , "Standard" , "Fact that illustrates a general rule" .)

I've seen this clue in The Times.

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