Digging with this, half of it may get lower (6)
I believe the answer is:
trowel
'digging with this half' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'it may get lower' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
an anagram of 'lower' is 'rowel' which is within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for trowel that I've seen before include "Small triangular tool for weeding in garden" , "Mortar-spreading tool" , "Something to help gardener" , "Small hand tool for gardening" , "Small hand tool for scooping" .)