Truly it's bravery, going without a bra! (4)
I believe the answer is:
very
'truly' is the definition.
(I've seen this before)
'bravery going without a bra' is the wordplay.
'VERY' is hidden within the letters.
However, I am unsure how this is indicated.
'it's' is the link.
Can you help me to learn more?
(Other definitions for very that I've seen before include "Sort of light" , "Extremely - light" , "- light is a flare" , "jolly British!" , "Exceedingly" .)