Moral support (7)

I think it could be either:

Which length description are you looking for?:

upright

I believe this clue is a double definition.

'moral' is the first definition.
(I've seen this before)

'support' is the second definition.
(upright is a kind of support)

(Other definitions for upright that I've seen before include "Pole; principled" , "In an erect position" , "Joanna" , "Vertically honourable?" , "Keyboard instrument" .)

I've seen this clue in The Guardian and The Telegraph.

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