Requiring great effort (7)
'requiring great effort' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for herculean that I've seen before include "Powerful" , "Old Labour" , "Monumental (task)" , "Enormously demanding (task)" , "Showing great strength" .)
'requiring great effort' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for strenuous that I've seen before include "Vigorous" , "Physically demanding" , "requiring much effort" , "Needing much effort" , "Very active" .)
(Other definitions for demanding that I've seen before include "Requiring much effort" , "Requesting" , "Stringent" , "Exigent" .)
'requiring great effort' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for arduous that I've seen before include "Demanding great effort" , "Difficult, laborious" , "Extremely taxing" , "Daunting: strenuous" , "Requiring much effort" .)