Crossword Genius

Royal couple put their foot in it (3)

Ross

I believe the answer is:

err

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'their foot in it' is the definition.
I can't tell whether this defines the answer.

'royal couple' is the wordplay.
'royal couple' means two substitutions for 'royal'.
'royal' becomes 'er' (abbreviation for Elizabeth Regina).
'royal' becomes 'r' (abbreviation).
'er'+'r'='ERR'

'put' is the link.

Can you help me to learn more?

(Other definitions for err that I've seen before include "Go wrong" , "Make a wrong move" , "'To . . . is human, to forgive divine'" , "do something you shouldn't" , "Be mistaken" .)

I've seen this clue in The Times.
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