The most common and most likely answer to this crossword clue is the 5 letter word SLOPS
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More clues leading to the result SLOPS
Buddy explains!

The straight part
We know that "Seamen’s clothes and bedding/old coppers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case seamen’s clothes and bedding/old coppers = slops.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 SLOPS mean?
SLOPS noun- A loose outer garment; a jacket or overall.
- (chiefly in the plural) A rubber thong sandal.
- (in the plural) See slops.
- Liquid or semi-solid; goo, paste, mud.
- (sometimes in the plural) Scraps used as food for animals, especially pigs or hogs.
- (chiefly in the plural) Inferior, weak drink or liquid food.
- (sometimes in the plural) Domestic liquid waste; household wastewater.
- Water or other liquid carelessly spilled or thrown about, as upon a table or a floor; a puddle; a soiled spot.
- Human urine or excrement.
- (costers) A policeman.
- Loose trousers.
- Sailors’ breeches ending just below the knees or above the ankles, worn mainly in XVIII century.
- Clothing and bedding issued to sailors.
- A loose outer garment; a jacket or overall.
- (chiefly in the plural) A rubber thong sandal.
- (in the plural) See slops.
- Liquid or semi-solid; goo, paste, mud.
- (sometimes in the plural) Scraps used as food for animals, especially pigs or hogs.
- (chiefly in the plural) Inferior, weak drink or liquid food.
- (sometimes in the plural) Domestic liquid waste; household wastewater.
- Water or other liquid carelessly spilled or thrown about, as upon a table or a floor; a puddle; a soiled spot.
- Human urine or excrement.
- To spill or dump liquid, especially over the rim of a container when it moves.
- To spill liquid upon; to soil with a spilled liquid.
- In the game of pool or snooker to pocket a ball by accident; in billiards, to make an ill-considered shot.
- To feed pigs
- (costers) A policeman.