Asked for a search to be made, in the grass (9)
I believe the answer is:
Here is my best explanation:
'asked for' is the definition.
('request' can be a synonym of 'ask for')
'a search to be made in the grass' is the subsidiary indication.
'a search' becomes 'quest' (quest is a kind of search).
'to be made in' indicates putting letters inside.
'the grass' becomes 'reed' (I've seen this in other clues).
'quest' placed into 'reed' is 'requested'.
(Another definition for requested that I've seen is "Asked for".)