Seriously thinking of how to get a grip on (6)

I believe the answer is:

poring

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'seriously thinking' is the definition.
'poring' can be an answer for 'thinking' (poring is a kind of thinking). I am not sure about the 'seriously' bit.

'how to get a grip on' is the wordplay.
'how' indicates an anagram (I've seen this in other clues).
'to get' means one lot of letters go next to another.
'grip' put next to 'on' is 'gripon'.
'gripon' is an anagram of 'PORING'.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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