Crossword Genius

Term for each moon day (6)

Ross

I believe the answer is:

period

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

'each moon day' is the wordplay.
'each' becomes 'per'.
'moon' becomes 'io' (moon of Jupiter).
'day' becomes 'd'.
'per'+'io'+'d'='PERIOD'

'for' is the link.

(Other definitions for period that I've seen before include "term" , "Amount of time - US full stop" , "A portion of time" , "Stop in America" , "Time allocated for lesson in school" .)

I've seen this clue in The Guardian.
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