Crossword Genius

Exhausted writer added to stanza (5)

Ross

I believe the answer is:

spent

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

'exhausted' is the definition.
(I know that exhausted can be written as spent)

'writer added to stanza' is the wordplay.
I cannot quite see how this works, but
'writer' could be 'pen' (something which writes) and 'pen' is located in the answer.
The remaining letters 'st' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for spent that I've seen before include "Worn out, having laid out money" , "Worn Out, exhausted" , "Drained of energy - or paid out" , "Worn out - after shopping?" , "Exhausted, having paid money?" .)

I've seen this clue in The Daily Express.
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