Clarify (verb) / Seek clarification on
UsageClarify is a transitive verb and normally takes a direct object; the noun phrase clarification on names the matter that needs explanation.
Clarify (verb)
Use when
You mean make a point, issue or requirement clearer; place the object directly after the verb.
Example
“Please clarify the discrepancy before the figures are submitted.”
Seek clarification on
Use when
You use the noun clarification and name the matter about which more explanation is needed.
Example
“We sought clarification on the treatment of committed expenditure.”
Quick check
clarify on the issue
Usage note
Use clarify the issue or seek clarification on the issue. Other constructions may be possible when on belongs to a separate phrase.