The most common and most likely answer to this crossword clue is the 10 letter word MAINSTREAM
I've seen this crossword clue in The Times
M
A
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M
More clues leading to the result MAINSTREAM
- Conventional source of water and power involving river
- Sea mist over Ramsgate front is normal
- Mister, a man surprisingly normal
- Complying with the standard electricity supply point in public transport?
- Standard electricity supplier: a meter’s faulty without energy
- Regular international among male side gaining runs
- Ordinary mother at home, virtuous person getting about in the morning
- Crew crossing island river must show standard
- Scholar favoured master that’s developed standard
- Normal raiments patched up by mother
Buddy explains!

The straight part
We know that "normal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case normal = mainstream.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 MAINSTREAM mean?
MAINSTREAM noun- The principal current in a flow, such as a river or flow of air
- (usually with the) That which is common; the norm.
- To popularize, to normalize, to render mainstream.
- To become mainstream.
- To educate (a disabled student) together with non-disabled students.
- Used or accepted broadly rather than by small portions of a population or market.