Alternating crops needs overtime in allotment (8)

I believe the answer is:

rotation

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

'alternating crops needs overtime in allotment' is the definition.
I can't tell whether this definition defines the answer.

'overtime in allotment' is the wordplay.
'overtime' becomes 'OT' (O and T are abbreviations for over and time).
'in' is an insertion indicator.
'allotment' becomes 'ration' (I've seen this in other clues).
'ot' going inside 'ration' is 'ROTATION'.

Can you help me to learn more?

(Other definitions for rotation that I've seen before include "Going round" , "Turn of a wheel" , "altering of crops" , "The action of moving around an orbit" , "Turning motion" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.