Reading novel about Pole being threatened (2,6)

'being threatened' is the definition.
(I've seen this in another clue)

'reading novel about pole' is the wordplay.
'novel' indicates an anagram (letters in a new or novel order).
'about' means one lot of letters goes inside another.
'pole' becomes 'n' (abbreviation for North, as in North Pole).
'reading' anagrammed gives 'indager'.
'indager' placed around 'n' is 'IN DANGER'.