Crossword Genius

Heinrich? He gets in with a key (5)

Ross

I believe the answer is:

heine

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'heinrich? he gets in with a key' is the definition.
The definition suggests a singular noun which matches the answer.

'he gets in with a key' is the wordplay.
'gets' is a charade indicator (letters next to each other).
'with' is a charade indicator (letters next to each other).
'a key' becomes 'E' (a musical key).
'he'+'in'+'e'='HEINE'

Can you help me to learn more?

(Other definitions for heine that I've seen before include "Heinrich -, nineteenth century German poet" , "Heinrich -, Ger. poet" .)

I've seen this clue in the Evening Standard.
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