Pen lines of chromium in flexible tips (6)

I believe the answer is:

script

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'pen lines of' is the definition.
'script' can be an answer for 'pen' (thesaurus). I am not sure about the 'lines of' bit.

'chromium in flexible tips' is the wordplay.
'chromium' becomes 'Cr' (chemical symbol).
'in' is an insertion indicator.
'flexible' is an anagram indicator (I've seen this in other clues).
'tips' with letters rearranged gives 'sipt'.
'cr' going into 'sipt' is 'SCRIPT'.

Can you help me to learn more?

(Other definitions for script that I've seen before include "Printed text" , "Orginal document" , "Dialogue" , "Performance text" , "Written version of a dramatic composition" .)

I've seen this clue in the Sydney Morning Herald.

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