Where boats may be made of tin and aluminium (5)
I believe the answer is:
canal
'where boats may be made' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'tin and aluminium' is the wordplay.
'tin' becomes 'can' (synonyms).
'and' is a charade indicator (letters next to each other).
'aluminium' becomes 'al' (Al is the chemical symbol for aluminium).
'can'+'al'='CANAL'
'of' is the link.
Can you help me to learn more?
(Other definitions for canal that I've seen before include "Artificial waterway as at Panama (5)" , "Artificial waterway for barges" , "Duct" , "Man-made strip of water" , "Aqueduct" .)