Emphasises the importance of second locks (8)

I believe the answer is:

stresses

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'emphasises the importance' is the definition.
'stresses' can be an answer for 'emphasises' ('stress' can be a synonym of 'emphasize'). I'm not sure about the 'the importance' bit.

'second locks' is the wordplay.
'second' becomes 's' (common abbreviation).
'locks' becomes 'tresses' (I've seen this before).
's'+'tresses'='STRESSES'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for stresses that I've seen before include "Puts pressure on" , "Lays emphasis on" , "Pressures or tensions" .)

I've seen this clue in The Telegraph.

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