Cunning but not to start with having information on gas (6)
I believe the answer is:
oxygen
'gas' is the definition.
(thesaurus)
'cunning but not to start with having information' is the wordplay.
I cannot quite understand how this works, but
'information' could be 'gen' (gen is a kind of information) and 'gen' is located in the answer.
This explanation may well be incorrect...
'on' is the link.
Can you help me to learn more?
(Other definitions for oxygen that I've seen before include "Gas that combines with hydrogen to form water" , "Twist together" , "Gas given off in photosynthesis" , "Most abundant element in the earth's crust" , "Gas forming about 20 per cent of atmosphere" .)