Crossword Genius

Eg motel's promise in connection with case (11,4)

Ross

I believe the answer is:

portmanteau word

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'eg motel's' is the definition.
('motel' is a portmanteau of 'motor' and 'hotel')

'promise in connection with case' is the wordplay.
'promise in connection' becomes 'word' (I can't explain this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'case' becomes 'portmanteau' (portmanteau is a kind of case).
'word' after 'portmanteau' is 'PORTMANTEAU WORD'.

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(Other definitions for portmanteau word that I've seen before include "Televangelist perhaps" , "E.g. biopic" , "fanzine, for one" , "motel, perhaps" .)

I've seen this clue in The Times.
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