One's stoned, having foolish date on company time (7)
I believe the answer is:
apricot
'one's stoned having foolish' is the definition.
I can't judge whether this definition defines the answer.
'date on company time' is the wordplay.
'date on' becomes 'apri' (I can't justify this - if you can you should believe this answer much more).
'company' becomes 'co' (abbreviation).
'time' becomes 't' (abbreviation).
'apri'+'co'+'t'='APRICOT'
Can you help me to learn more?
(Other definitions for apricot that I've seen before include "Orange-yellow fruit in plum family" , "Soft, peach-like fruit" , "Juicy stone-fruit related to plum and peach" , "shade" , "Luscious fruit" .)