Crossword Genius

Instruction when a group playing's trendy (7,4)

Ross

I believe the answer is:

abandon ship

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'instruction' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'a group playing's trendy' is the wordplay.
'group' becomes 'band' (band can mean a group of people).
'playing's' becomes 'on's' (on can mean playing or performing).
'trendy' becomes 'hip' (I've seen this in another clue).
'a'+'band'+'ons'+'hip'='ABANDON SHIP'

'when' is the 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" .)

I've seen this clue in The Mirror.
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