Left woman right of the moon (5)
I believe the answer is:
lunar
'of the moon' is the definition.
(I've seen this before)
'left woman right' is the wordplay.
'left' becomes 'L' (common abbreviation).
'woman' becomes 'una' ().
'right' becomes 'r' (common abbreviation).
'l'+'una'+'r'='LUNAR'
(Other definitions for lunar that I've seen before include "Selenic" , "One sort of month" , "Kind of eclipse" , "Period of 28 days" , "Of a natural satellite" .)