Religious woman into fish: odd dilemma (9)
I believe the answer is:
conundrum
'dilemma' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'religious woman into fish odd' is the wordplay.
'religious woman' becomes 'nun' (woman who has taken religious vows).
'into' means one lot of letters goes inside another.
'fish' becomes 'cod' (cod is a kind of fish).
'odd' becomes 'rum' (rum can mean strange or dubious).
'nun' inserted inside 'cod' is 'conund'.
'conund'+'rum'='CONUNDRUM'
Can you help me to learn more?
(Other definitions for conundrum that I've seen before include "It's a riddle or a hard question" , "Puzzling problem" , "Puzzling question" , "Difficult problem" , "Difficult question" .)