Instruction when a group playing's trendy (7,4)
I believe the answer is:
abandon ship
'instruction' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'a group playing's trendy' is the wordplay.
'a group' becomes 'aband' (I've seen this in other clues).
'playing's' becomes 'on's'.
'trendy' becomes 'hip' (I've seen this before).
'aband'+'ons'+'hip'='ABANDON SHIP'
'when' acts as a link.
Can you help me to learn more?
(Other definitions for abandon ship that I've seen before include "Go overboard" , "Leave a sinking vessel" , "get into lifeboats" .)