Crossword Genius

Film director gets part of spliff that's changed hands (5)

Ross

I believe the answer is:

loach

I'm a little stuck... Click here to teach me more about this clue!

'changed hands' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'film director gets part of spliff' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
'part' could be 'la' (la is a kind of part) and 'la' is located in the remaining letters.
The remaining letters 'ch' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for loach that I've seen before include "Film-maker" , "Fish with barbels around mouth" , "Freshwater fish; rhymes with freshwater fish" , "Fish - British film director" , "River fish - film director" .)

I've seen this clue in The Independent.
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