Film in April, May and June? (8,5)

I believe the answer is:

calendar girls

'film' is the definition.
(I have seen 'Popular film' mean 'calendar girls' so perhaps 'film' could also mean 'calendar girls')

'april may and june?' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'and' is 'nda' which is within the answer.
This explanation may well be incorrect...

'in' acts as a link.

(Another definition for calendar girls that I've seen is " Popular film".)

I've seen this clue in The Guardian.

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.