Push bucket down, carrying tons without doubt (3,7)
I believe the answer is:
for certain
'without doubt' is the definition.
(I've seen this before)
'push bucket down carrying tons' is the wordplay.
I cannot really understand how this works, but
'push' could be 'force' (synonyms) and 'force' is located in the answer.
'tons' could be 't' and 't' is found in the answer.
'bucket' could be 'rain' (eg bucketing down means raining) and 'rain' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for for certain that I've seen before include "definitely" , "without a doubt" , "Assuredly" , "surely" .)