Rudimentary answer secured by tossing the coin (8)
I believe the answer is:
inchoate
'rudimentary' is the definition.
(both can mean still in development)
'answer secured by tossing the coin' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'secured by' means one lot of letters goes inside another (inserted letters are held or secured).
'tossing' indicates an anagram.
'the'+'coin'='thecoin'
'thecoin' is an anagram of 'inchote'.
'a' put into 'inchote' is 'INCHOATE'.
(Other definitions for inchoate that I've seen before include "Action he took having just begun" , "Imperfectly formed" , "just beginning" , "Rough" , "Only half-formed" .)