Intensively research added levies on a regular basis (5)

I believe the answer is:

delve

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'intensively research' is the definition.
'delve' can be an answer for 'research' (I've seen this before). I am not sure about the 'intensively' bit.

'added levies on a regular basis' is the wordplay.
'on a regular basis' indicates alternate letters.
'added'+'levies'='addedlevies'
The alternate letters of 'addedlevies' are 'DELVE'.

Can you help me to learn more?

(Other definitions for delve that I've seen before include "Search deeply for information" , "Dig - investigate" , "Burrow" , "Look closely (into)" , "Hollow" .)

I've seen this clue in The Times.

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