The most common and most likely answer to this crossword clue is the 7 letter word MYALGIA
I've seen this crossword clue in The Daily Telegraph
M
Y
A
L
G
I
A
More clues leading to the result MYALGIA
- Wow! Seaweed suppresses one muscular pain
- Blimey, country shunning our queen is a pain
- Compiler’s seaweed absorbing compiler’s pain
- Setter’s queen escapes from Algeria — what a pain!
- I may lag badly, suffering such pain
- Muscle pain got by a student in fitness centre around Iowa
- Pain — managed amazingly without New Zealand!
- Blimey, Gila has essentially produced something that’s painful!
Buddy explains!

The straight part
We know that "Pain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pain = myalgia.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 MYALGIA mean?
MYALGIA noun- Muscular pain or tenderness.