Twin girls start drawing with striking colour (5)
I believe the answer is:
vivid
'striking colour' is the definition.
'vivid' can be an answer for 'striking' (I've seen this in another clue). I'm not sure about the 'colour' bit.
'twin girls start drawing' is the wordplay.
'twin girls' means two replacements for 'girl'.
'girl' becomes 'vi' (short for Violet).
'girl' becomes 'vi' (short for Violet).
'start' indicates taking the first letters.
The initial letter of 'drawing' is 'd'.
'vi'+'vi'+'d'='VIVID'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for vivid that I've seen before include "Intense" , "Lifelike, striking" , "Brilliantly coloured - full of life" , "Brilliant" , "Presenting a clear and striking picture" .)