Crossword Genius

Sort of convertible in which a pal might crash? (4,3)

Ross

I believe the answer is:

sofa bed

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

'sort of convertible' is the definition.
'sofa bed' can be an answer for 'convertible' (synonyms). I am unsure of the 'sort of' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sofa bed that I've seen before include "guest accommodation?" , "One may be lying here!" , "Bifunctional furniture item" , "Seat that converts for sleeping on" , "dual-purpose item of furniture" .)

I've seen this clue in The Independent.
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