The most common and most likely answer to this crossword clue is the 4 letter word BERG
I've seen this crossword clue in The Times
B
E
R
G
More clues leading to the result BERG
- Mountain climber grabbing holds
- Quantity of work by British composer
- Evidence of work done by British composer
- Run in live game's first for scorer
- Aquatic bird seen briefly over mass of ice
- Diving bird cropped up as feature of icy waters
- . Dangerous water feature some plumber grouts
- Barman in short dash away from northern city
- Request to entertain royal composer
- Sponge cakes right for composer
Buddy explains!

The straight part
We know that "composer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case composer = berg.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 BERG mean?
BERG noun- An iceberg.
- Mountain