Fork almost laid flat on top of grill (5)
I believe the answer is:
prong
'fork' is the definition.
(thesaurus)
'almost laid flat on top of grill' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'laid flat' becomes 'prone'.
'on top of' says to take the initial letters (I've seen 'on top' mean this).
The initial letter of 'grill' is 'g'.
'prone' with its final letter taken off is 'pron'.
'pron'+'g'='PRONG'
(Other definitions for prong that I've seen before include "Spike of fork etc" , "Spur; projecting part" , "Fork's point" , "tip?" , "branch" .)