Recommend highly (4)
I believe the answer is:
tout
'recommend highly' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tout that I've seen before include "Profiteering ticket seller" , "Hawk brazenly" , "Solicit, canvass" , "All in Paris" , "Attempt to sell, perhaps by pestering" .)