Good ground to store a fuel for heating (3,3)
I believe the answer is:
gas oil
'fuel for heating' is the definition.
'gas oil' can be an answer for 'fuel' (I've seen this before). I'm not sure about the 'for heating' bit.
'good ground to store a' is the wordplay.
'good' becomes 'g' (abbreviation).
'ground' becomes 'soil' (synonyms).
'to store' is an insertion indicator.
'g'+'soil'='gsoil'
'gsoil' going around 'a' is 'GAS OIL'.
Can you help me to learn more?
(Other definitions for gas oil that I've seen before include "Type of fuel" , "Fuel distilled from petroleum" .)