Past and present stretcher (8)

I believe the answer is:

extender

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'stretcher' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'past and present' is the wordplay.
'past' becomes 'ex' (similar in meaning).
'and' says to put letters next to each other.
'present' becomes 'tender' (tendering is a kind of presenting).
'ex'+'tender'='EXTENDER'

Can you help me to learn more?

(Other definitions for extender that I've seen before include "one to reach out" , "stretcher required?" .)

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

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