Crossword Genius

Changes of gear depend on them (7,5)

Ross

I believe the answer is:

clothes lines

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'changes' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'gear depend on them' is the wordplay.
I cannot really see how this works, but
'gear' could be 'clothes' (I've seen this in another clue) and 'clothes' is found in the answer.
The remaining letters 'lines' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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