Airline routine shows forte with hearts to restrain moderate stroke (6,4)
I believe the answer is:
flight path
'airline routine shows forte' is the definition.
I can't tell whether this defines the answer.
'hearts to restrain moderate stroke' is the wordplay.
'hearts' becomes 'h' (abbreviation used in card games e.g. bridge).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'restrain moderate' becomes 'flight' (I can't explain this - if you can you should give a lot more credence to this answer).
'stroke' becomes 'pat' (pat can mean to stroke or touch).
'flight'+'pat'='flightpat'
'h' after 'flightpat' is 'FLIGHT PATH'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for flight path that I've seen before include "Escape route" , "Escape road" , "followed by Galileo, for instance" , "that was fatal for Icarus" .)