The most common and most likely answer to this crossword clue is the 3 letter word ADD
A
D
D
More clues leading to the result ADD
- Say more days will be attached to allowance at the outset
- A divine tot
- Join old man, heading some way back
- An accessory nowadays put onAn accessory nowadays put on
- Put on commercial broadcast in the middle
- Sum up a cleric
- Tot knocks the edges of father
- Extra charges with dad and son both playing
- Faceless nerd going to extremes with computer stuff
- Notice put on computer peripheral?
Buddy explains!

The straight part
We know that "computer peripheral" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case computer peripheral = add.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 ADD mean?
ADD noun- An act or instance of adding.
- An additional enemy that joins a fight after the primary target.
- To join or unite (e.g. one thing to another, or as several particulars) so as to increase the number, augment the quantity or enlarge the magnitude, or so as to form into one aggregate.
- To sum up; to put together mentally.
- To combine elements of (something) into one quantity.
- To give by way of increased possession (to someone); to bestow (on).
- To append (e,g, a statement); to say further information.
- To make an addition; to augment; to increase.
- To perform the arithmetical operation of addition.
- To summon minions or reinforcements.