Crossword Genius

Religious festival managed to include a cross (7)

Ross

I believe the answer is:

ramadan

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

'religious festival' is the definition.
(I've seen this before)

'managed to include a cross' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for ramadan that I've seen before include "Religious festival" , "Islam holy month" , "Month in Muslim calendar" , "Month of fasting from dawn to dusk" , "Ninth month of Muslim year, time to fast" .)

I've seen this clue in The Sunday Times and The Sun.
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