See nothing in Manila (3)
I believe the answer is:
nil
'see nothing' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'in manila' is the wordplay.
'in' says the answer is hidden in the clue.
'NIL' is hidden in the letters of 'manila'.
Can you help me to learn more?
(Other definitions for nil that I've seen before include "Non-existent" , "Nothing - in Latin" , "You get nothing" , "Score of nought" , "0" .)