Make an issue of a seventh part (4)

I believe the answer is:

vent

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'make' is the definition.
(I know that vent is a type of freshen)

'of a seventh part' is the wordplay.
'of' says the answer is hidden in the clue.
'VENT' is hidden within 'seventh part'.

'an issue' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for vent that I've seen before include "Give free expression to -- opening" , "Opening releasing gas" , "[BLOWHOLE] ?" , "Let off steam" , "Slit in the back of a jacket" .)

I've seen this clue in the Evening Standard.

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