Ship has solid bits (6)
I believe the answer is:
shards
'bits' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I can't see?
'ship has solid' is the wordplay.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'has' means one lot of letters goes inside another.
'solid' becomes 'hard' (similar in meaning).
'ss' enclosing 'hard' is 'SHARDS'.
Can you help me to learn more?
(Other definitions for shards that I've seen before include "Brittle fragments" , "Fragments of broken glass" , "'Broken pieces, of glass say (6)'" , "Broken pieces of glass or pottery" , "Broken pieces of something brittle" .)