Cryptic crossword clue
Forged bill in M&S or Aldi, say, a source of irritation 9

The most common and most likely answer to this crossword clue is the 9 letter word CHILBLAIN

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "a source of irritation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a source of irritation = chilblain.
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 CHILBLAIN mean?

CHILBLAIN noun
  1. An itchy purple red inflammation of the skin, especially of the hands, feet and ears, occurring when capillaries below the skin are damaged by exposure to cold weather.

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