What can relieve the gloom of strike during journey by air (10)
I believe the answer is:
flashlight
'what can relieve the gloom' is the definition.
I can't judge whether this defines the answer.
'strike during journey by air' is the wordplay.
'strike' becomes 'lash' (lashing is a kind of striking).
'during' is an insertion indicator.
'journey by air' becomes 'flight' (I've seen this before).
'lash' inserted inside 'flight' is 'FLASHLIGHT'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for flashlight that I've seen before include "shiner" , "Beamer" , "that's illuminating" , "Electric torch" , "It may be needed to see" .)