The most common and most likely answer to this crossword clue is the 15 letter word STRIKE-BREAKING
I've seen this crossword clue in The Times
S
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Buddy explains!
The straight part
We know that "working despite action" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case working despite action = strike-breaking.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does STRIKE-BREAKING mean?
STRIKE-BREAKING verb- To break a strike; to work for a business where the union members are on strike.
- Activity intended to disrupt or end without an agreement a strike by workers.