A back seat that may put you in the shade (6)

I believe the answer is:

howdah

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

'a back seat' is the definition.
'howdah' can be an answer for 'seat' (howdah is a kind of seat). I am not sure about the 'a back' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for howdah that I've seen before include "Does it get you high for a trip" , "high chair" , "Seat fixed on an elephant" , "Elephant rider's chair" , "something to accommodate Jumbo passenger?" .)

I've seen this clue in the Evening Standard.

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