Greenhouse gas found by Chinese engineer (7)
I believe the answer is:
methane
'greenhouse gas' is the definition.
(I've seen this before)
'found by chinese engineer' is the wordplay.
'found' becomes 'met' (synonym).
'by' says to put letters next to each other.
'chinese' becomes 'han' (Chinese dynasty).
'engineer' becomes 'e' (this might be a standard abbreviation I've not previously seen).
'met'+'han'+'e'='METHANE'
Can you help me to learn more?
(Other definitions for methane that I've seen before include "Get fuel" , "Marsh-gas" , "Naturally occurring flammable gas" , "Flammable gas, CH4" , "Firedamp" .)