Crossword Genius

Hard work, many discovered, to produce advertising jingle (6)

Ross

I believe the answer is:

slogan

'advertising jingle' is the definition.
(I've seen this before)

'hard work many discovered' is the wordplay.
'hard work' becomes 'slog' (a slog is a long or difficult task).
'discovered' means to look at the middle letters (dis-covered - outer letters removed).
The middle letters of 'many' are 'an'.
'slog'+'an'='SLOGAN'

'to produce' is the link.

(Other definitions for slogan that I've seen before include "short political statement" , "War cry - advertising jingle" , "Catchy phrase in advertisement etc" , "Tag line" , "Motto, catchy phrase" .)

I've seen this clue in The Telegraph.
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