The most common and most likely answer to this crossword clue is the 8 letter word FIDDLING
F
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D
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Buddy explains!
The straight part
We know that "That's no big deal!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that's no big deal! = fiddling.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 FIDDLING mean?
FIDDLING verb- To play aimlessly.
- To adjust or manipulate for deception or fraud.
- To play traditional tunes on a violin in a non-classical style.
- To touch or fidget with something in a restless or nervous way, or tinker with something in an attempt to make minor adjustments or improvements.
- Action of the verb to fiddle
- Of petty or trivial importance; footling