Bag rocketing as at speed of light (3)
I believe the answer is:
sac
'bag' is the definition.
(a small bag)
'rocketing as at speed of light' is the wordplay.
'rocketing as' becomes 'sa' (I can't justify this - if you can you should believe this answer much more).
'at' is a charade indicator (letters next to each other).
'speed of light' becomes 'c' (I've seen this in other clues).
'sa'+'c'='SAC'
Can you help me to learn more?
(Other definitions for sac that I've seen before include "Bladder" , "Distended membrane; pouch-like cavity" , "Traditional entitlement to hold court" , "Bag-like cavity" , "Bag, pouch; cyst" .)