Airline holds suitable IC cert. for a type of energy (10)
I believe the answer is:
electrical
'airline holds suitable ic' is the definition.
I can't tell whether this definition defines the answer.
'cert for a type of energy' is the wordplay.
'cert' becomes 'al' (I am not sure about this - if you are sure you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'a type of energy' becomes 'electric' (I've seen this before).
'al' put after 'electric' is 'ELECTRICAL'.
Can you help me to learn more?
(Other definitions for electrical that I've seen before include "Like goods with plugs" , "Concerning current" , "Like some storms" , "Concerned with current" .)