Crossword Genius

Complain before retrograde toilet is used for joint movement (7)

Ross

I believe the answer is:

carpool

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

'used for joint movement' is the definition.
I know nothing about this answer so I can't tell whether this works.

'complain before retrograde toilet' is the wordplay.
'complain' becomes 'carp' (I've seen this before).
'before' is a charade indicator (letters next to each other).
'retrograde' is a reversal indicator.
'toilet' becomes 'loo' (loo is a kind of toilet).
'loo' in reverse letter order is 'ool'.
'carp'+'ool'='CARPOOL'

'is' is the link.

Can you help me to learn more?

(Another definition for carpool that I've seen is " driving arrangement?".)

I've seen this clue in The Hindu.
Want a hint initially instead of a full solution? Install my app