Sprinkler held by a hundred Germans (7)
I believe the answer is:
dredger
'sprinkler' is the definition.
(I've seen this before)
'held by a hundred germans' is the wordplay.
'held by' says the answer is hidden in the clue.
'DREDGER' is hidden in the letters of 'hundred germans'.
(Other definitions for dredger that I've seen before include "Boat used in scooping out mud, etc., from the bottom of a river" , "Boat for deepening waterways" , "ship" , "Boat removing mud" , "Vessel for dragging the bottom" .)