Frequently related to XX? (10)

I believe the answer is:

oftentimes

'frequently' is the definition.
(I know that frequently can be written as oftentimes)

'related to xx?' is the wordplay.
'related to' becomes 'of' (something 'of' something else is related to it).
'xx?' becomes 'ten times' (Roman numeral for ten and the times symbol).
'of'+'tentimes'='OFTENTIMES'

(Another definition for oftentimes that I've seen is " Frequently (archaic)".)

I've seen this clue in The Times.

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