Cryptic crossword clue
Acting like a scared hack, being a tosser 6

The most common and most likely answer to this crossword clue is the 6 letter word SHYING

S
H
Y
I
N
G

Buddy explains!

The straight part
We know that "double defn.(?)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case double defn.(?) = shying.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does SHYING mean?

SHYING verb
  1. To avoid due to timidness or caution.
  2. To jump back in fear.
  3. To throw sideways with a jerk; to fling
SHYING noun
  1. The act of one who shies or turns aside in fear.

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