How it will take a breath before diving? (6)
I believe the answer is:
puffin
'how it will take a' is the definition.
I can't tell whether this defines the answer.
'breath before diving?' is the wordplay.
'breath' becomes 'puff' (puff is a kind of breath).
'before' says to put letters next to each other.
'diving?' becomes 'in' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'puff'+'in'='PUFFIN'
Can you help me to learn more?
(Other definitions for puffin that I've seen before include "Bird with colourful beak" , "Variety of auk" , "Bird with large beak" , "Seabird (breathin' heavily?)" , "Seabird with a colourful bill" .)