Crossword Genius

Rigid back (5)

Ross

I believe the answer is:

stern

I believe this clue is a double definition.

'rigid' is the first definition.
(thesaurus)

'back' is the second definition.
(stern is a kind of back)

(Other definitions for stern that I've seen before include "Demanding < back" , "Dour" , "Unrelenting at the back of the boat?" , "Inflexible; back" , "Authoritarian, back" .)

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