Distinguished pilot can be gauche occasionally (3)
I believe the answer is:
ace
'distinguished pilot' is the definition.
'ace' can be an answer for 'pilot' (term for military pilot). I am unsure of the 'distinguished' bit.
'gauche occasionally' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
The alternating letters of 'gauche' are 'ACE'.
'can be' acts as a link.
Can you help me to learn more?
(Other definitions for ace that I've seen before include "Brilliant" , "star" , "Top playing card" , "Unbeatable service" , "Top card or champion" .)