Snake here has more than half twisted (7)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

When  PRES [more than half] of PRESENT (here) is reversed [twisted] the result is SERPENT.  This is the parsing suggested by Quadrophenia in the first comment below. Many thanks for this, Q as I’m sure that is what the setter intended. My original  parsing was: SERPENT{ine} (twisted) [more than half]. I think at a glance it just about works but  it doesn’t account for ‘here’, ‘is’ would be better than ‘has’ and as I went on to say, it’s a little vague on the deletion instructions. I would have expected ‘more than half’ of a 10-letter word to mean 6 letters rather than 7.  This expectation is borne out in the new parsing with ‘more than half’ of PRESENT indicating 4 of 7 letters.